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题名:
X-ray stars observed in LAMOST spectral survey
作者: Lu, Hong-peng1,2,3; Zhang, Li-yun1,2,3; Han, Xianming L.1,3,4; Shi, Jianrong5
刊名: ASTROPHYSICS AND SPACE SCIENCE
出版日期: 2018-05-01
卷号: 363, 期号:5
DOI: 10.1007/s10509-018-3328-8
学科分类: 天文学
收录类别: SCI
通讯作者: Zhang, Li-yun, Email: liy_zhang@hotmail.com
关键词: Stars: chromospheres ; Stars: activity ; Stars: X-ray ; Stars: spectroscopic
英文摘要: X-ray stars have been studied since the beginning of X-ray astronomy. Investigating and studying the chromospheric activity from X-ray stellar optical spectra is highly significant in providing insights into stellar magnetic activity. The big data of LAMOST survey provides an opportunity for researching stellar optical spectroscopic properties of X-ray stars. We inferred the physical properties of X-ray stellar sources from the analysis of LAMOST spectra. First, we cross-matched the X-ray stellar catalogue (12254 X-ray stars) from ARXA with LAMOST data release 3 (DR3), and obtained 984 good spectra from 713 X-ray sources. We then visually inspected and assigned spectral type to each spectrum and calculated the equivalent width (EW) of Ha line using the Hammer spectral typing facility. Based on the EW of H alpha line, we found 203 spectra of 145 X-ray sources with H alpha emission above the continuum. For these spectra we also measured the EWs of H beta, H gamma, H delta and Ca II IRT lines of these spectra. After removing novae, planetary nebulae and OB-type stars, we found there are 127 X-ray late-type stars with Ha line emission. By using our spectra and results from the literature, we found 53 X-ray stars showing H alpha variability; these objects are Classical T Tauri stars (CTTs), cataclysmic variables (CVs) or chromospheric activity stars. We also found 18 X-ray stars showing obvious emissions in the Ca II IRT lines. Of the 18 X-ray stars, 16 are CTTs and 2 are CVs. Finally, we discussed the relationships between the EW of Ha line and X-ray flux.
项目资助者: National Development and Reform Commission ; NSFC(U1631236, U1431114, 11263001) ; Chinese Academy of Sciences (CAS)(U1631236, U1431114, 11263001) ; CAS Key Laboratory of Solar Activity, National Astronomical Observatories(KLSA201806)
语种: 英语
原文出处: 查看原文
ISSN号: 0004-640X
文章类型: Article
WOS标题词: Science & Technology ; Physical Sciences
研究领域[WOS]: Astronomy & Astrophysics
类目[WOS]: Astronomy & Astrophysics
关键词[WOS]: T-TAURI STARS ; MAIN-SEQUENCE STARS ; HIGH-RESOLUTION SPECTROSCOPY ; EMISSION-LINE STARS ; DIGITAL SKY SURVEY ; NORTH GALACTIC POLE ; CATACLYSMIC VARIABLE CANDIDATES ; BRIGHT SOURCE CATALOG ; HERBIG AE/BE STARS ; AURIGA DARK CLOUDS
WOS记录号: WOS:000431355300024
Citation statistics:
内容类型: 期刊论文
URI标识: http://ir.ynao.ac.cn/handle/114a53/12362
Appears in Collections:中国科学院天体结构与演化重点实验室_期刊论文

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作者单位: 1.College of Physics/Department of Physics and Astronomy &
2.CAS Key Laboratory of Solar Activity, National Astronomical
3.Key Laboratory for the Structure and Evolution of Celestial
4.Dept. of Physics and Astronomy, Butler University, Indianapolis,
5.National Astronomical Observatories, Chinese Academy of

Recommended Citation:
Lu, Hong-peng,Zhang, Li-yun,Han, Xianming L.,et al. X-ray stars observed in LAMOST spectral survey[J]. ASTROPHYSICS AND SPACE SCIENCE,2018,363(5).
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